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ADC0851BIN Datasheet(PDF) 1 Page - National Semiconductor (TI) |
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ADC0851BIN Datasheet(HTML) 1 Page - National Semiconductor (TI) |
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1 / 36 page  TLH11021 January 1995 ADC0851 and ADC0858 8-Bit Analog Data Acquisition and Monitoring Systems General Description The ADC0851 and ADC0858 are 2 and 8 input analog data acquisition systems They can function as conventional mul- tiple input AD converters automatic scanning AD convert- ers or programmable analog ‘‘watchdog’’ systems In ‘‘watchdog’’ mode they monitor analog inputs and deter- mine whether these inputs are inside or outside user pro- grammed window limits This monitoring process takes place independent of the host processor When any input falls outside of its programmed window limits an interrupt is automatically generated which flags the processor the chip can then be interrogated as to exactly which channels crossed which limits The advantage of this approach is that its frees the proces- sor from having to frequently monitor analog variables It can consequently save having to insert many AD subrou- tine calls throughout real time application code In control systems where many variables are continually being moni- tored this can significantly free up the processor especially if the variables are DC or slow varying signals The Auto AD conversion feature allows the device to scan through selected input channels performing an AD conver- sion on each channel without the need to select a new channel after each conversion Applications Y Instrumentation monitoring and process control Y Digitizing automotive sensor signals Y Embedded diagnostics Key Specifications Y Resolution 8 Bits Y Total error g LSB or g 1 LSB Y Low power 50 mW Y Conversion time 18 msChannel Y Limit comparison time 2 msLimit Features Y Watchdog operation signals processor when any channel is outside user programmed window limits Y Frees microprocessor from continually monitoring analog signals and simplifies applications software Y 2 (ADC0851) or 8 (ADC0858) analog input channels Y Single ended or differential input pairs Y COM input for DC offsetting of input voltage Y 4 (ADC0851) and 16 (ADC0858) 8-bit programmable limits Y NSC MICROWIRETM interface Y Power fail detection Y Auto AD conversion feature Y Single 5V supply Y Window limits are user programmable via serial inter- face Simplified Block Diagram TLH11021 – 22 FIGURE 1 TRI-STATE is a registered trademark of National Semiconductor Corporation MICROWIRETM is a trademark of National Semiconductor Corporation C1995 National Semiconductor Corporation RRD-B30M75Printed in U S A |
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